When attempting to remove some files from iMovie I came across a media clip that I wanted to delete. When I attempted to delete the file, I was told I didn’t have access and I should change permissions on the file. Unfortunately I couldn’t find the file using the filename since it was embedded in the iMovie package. The way to delete the file is to navigate to the folder Movies, then Get Info on the iMovie library file and select Show Package Contents. Navigate to the project folder and select Original Media. Get Info on the file that can’t be deleted and uncheck the Locked checkbox. Then return to iMovie and now the project and file can be deleted.